815335139 has 2 divisors, whose sum is σ = 815335140. Its totient is φ = 815335138.

The previous prime is 815335133. The next prime is 815335153. The reversal of 815335139 is 931533518.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815335139 is a prime.

It is not a weakly prime, because it can be changed into another prime (815335133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407667569 + 407667570.

It is an arithmetic number, because the mean of its divisors is an integer number (407667570).

Almost surely, 2^815335139 is an apocalyptic number.

815335139 is a deficient number, since it is larger than the sum of its proper divisors (1).

815335139 is an equidigital number, since it uses as much as digits as its factorization.

815335139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 815335139 is about 28554.0739475123. The cubic root of 815335139 is about 934.2118818455.

The spelling of 815335139 in words is "eight hundred fifteen million, three hundred thirty-five thousand, one hundred thirty-nine".